I use the air conditioning setting all year long. So anytime the
outside temperature is above 35°F the a/c compressor is running.
This dehumidifies the air coming into the passenger's compartment
and prevents window fogging. When using the defroster to defog the
windshield the temperature setting needs to be on hot. Are you
losing coolant? If so, I'd suspect a leaking heater core. As far as
wipers go, get original equipment ones from the dealer. Yes, they're
more expensive but they're also much better and last a lot longer.
HTH. -Jim

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